Gedrite

Gedrite
Classificazione Strunz (ed. 10)9.DD.05[1]
Formula chimica☐Mg2(Mg3Al2)(Si6Al2)O22(OH)2[2]
Proprietà cristallografiche
Gruppo cristallinotrimetrico
Sistema cristallinoortorombico[2]
Parametri di cellaa=18,531(4)Å, b=17,741(4)Å, c=5,249(5)Å, V=1725,8ų, Z=4[3]
Gruppo puntuale2/m 2/m 2/m
Gruppo spazialePnma[3]
Proprietà fisiche
Densità misurata3,27[4] g/cm³
Densità calcolata3,18[3] g/cm³
Durezza (Mohs)5½-6[1]
Coloreda verde scuro a brunastro[4]
Lucentezzavitrea[1]
Strisciobianco[1]
Si invita a seguire lo schema di Modello di voce – Minerale

La gedrite è un minerale, un anfibolo appartenente al sottogruppo degli anfiboli di magnesio-ferro-manganese in base alla revisione della nomenclatura degli anfiboli del 2012[2], precedentemente era classificato come appartenente al gruppo degli anfiboli Mg-Fe-Mn-Li[5].

È stata scoperta da Adolphe d'Archiac nella valle di Héas nei pressi di Gèdre, dipartimento degli Alti Pirenei, Francia e descritta per la prima volta nel 1836 da Ours-Pierre-Armand Petit-Dufrénoy[6].

Morfologia

La gedrite si trova sotto forma di aghi in aggregati a forma di covone di grano[4].

Origine e giacitura

La gedrite si trova nelle rocce metasedimentarie associata a cordierite, biotite, almandino ed oligoclasio[4].

Note

  1. ^ a b c d (EN) Gedrite mineral information and data - mindat.org, su mindat.org. URL consultato il 18 novembre 2013.
  2. ^ a b c Hawthorne, p. 2035.
  3. ^ a b c Papike, p. 1947.
  4. ^ a b c d Kamineni, p. 1012.
  5. ^ Leake, p. 1359.
  6. ^ Dufrénoy, p. 582.

Bibliografia

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